Well, I don't know much about this topic (I have tried searching the net but nothing gives me exactly the info. I want) so here are my questions:1. What is oxidative stress? 2. What factors can cause oxidative stress in cells?3. How is it combated? I guess peroxisomes play a role in it though it is unclear to me. 4. What are the effects of uncontrolled or too much of oxidative stress?

An explanation instead of a wiki link would be appreciated. Thanks a lot.